CPC5750
Single-Channel
Voice Band CODEC
INTEGRATED
C
IRCUITS
D
IVISION
PRELIMINARY
Features
Description
• -law and A-law ITU G.711 Companding Codec
• Operates on +3.3V Power
• Differential Analog Signal Paths
• Programmable Transmit and Receive Gain, +/-12dB
in 0.1dB increments
• Transmit Path 60Hz Rejection Filter
• Differential amplifier drives +3.2dBm into 600
• Stable Gain over temperature
• PCM and IOM-2 GCI telecommunication interfaces
• Short and Long Frame Syncs Supported
• Independent Transmit and Receive Programmable
Time Slots
• Accepts PCLK from 512kHz to 8.192MHz
• SPI Serial Interface for control in PCM Mode
The CPC5750 is a voice-band CODEC with
pin-selectable PCM or IOM-2 (GCI) digital interfaces.
Clock frequencies for the PCM Mode range from
512kHz to 8.192MHz while the GCI interface allows
clocking at 2.048MHz and 4.096MHz. While the GCI
interface utilizes the integrated data link to read and
write the control registers, a four-wire Serial Peripheral
Interface (SPI) bus provides register access while in
PCM Mode.
The CODEC provides the necessary A/D and D/A
functions with pin-selectable -law or A-law
companding. A low-noise internal reference is used to
keep signal gains well controlled over supply and
temperature variations. Programmable gain of 12dB
for both transmit and receive allow the CPC5750 to
accept differential input signals as large as +8dBm,
and to source +3.2dBm differential signals into 600
while operating from a single 3.3V supply.
• Programmable Power Down Mode, I = 20A
DD
• Analog and Digital Loopback Modes for testing
Ordering Information
Part
Description
CPC5750U
SSOP-24 Package 50/Tube
SSOP-24 Package 2000/Reel
CPC5750UTR
CPC5750 Block Diagram
SCLK
SDI
SDO
CS
VDD
Control
Register
SPI
Interface
RST
POR
DLB
AIN+
AIN-
+
-
ADC
FIR
Filter
µ-law/A-law
Encoder
VREF
FS
DTX
BAND GAP
BUF
BUF
PCM/IOM-2
Interface
Logic
0.22µF
DRX
VDD
VEE
PCLK
SFSEL
MUTE
AOUT+
AOUT-
+
-
FIR
Filter
Noise
Shaper
m-law/A-law
Decoder
DAC
ALB
DS-CPC5750-Rev F
PRELIMINARY
1